rounding

1. ceil - rounding up

Description
float ceil ( float value )
returns the next integer not less than value, and if value has a fractional part, it is rounded up by one. The type returned by ceil() is still float, because the range of float values ​​is usually larger than that of integers.
Example 1. ceil() example

 

Copy the code The code is as follows:

<?php
echo ceil(4.3); // 5
echo ceil(9.999); // 10
?>

 

2. floor - rounding up

Description
float floor ( float value )
returns the next integer not greater than value, rounding off the fractional part of value. The type returned by floor() is still float, because the range of float values ​​is usually larger than that of integers.
Example 1. floor() example

 

Copy the code The code is as follows:

<?php
echo floor(4.3); // 4
echo floor(9.999); // 9
?>

 

3. round - rounds floating point numbers

DESCRIPTION
float round ( float val [, int precision] )
returns the result of rounding val to the specified precision precision (the number of digits after the decimal point). precision can also be negative or zero (default).
Example 1. round() example

 

Copy the code The code is as follows:

<?php
echo round(3.4); // 3
echo round(3.5); // 4
echo round(3.6); // 4
echo round(3.6, 0); // 4
echo round(1.95583, 2); // 1.96
echo round(1241757, -3); // 1242000
echo round(5.045, 2); // 5.05
echo round(5.055, 2); // 5.06
?>

 

Fourth, intval - convert the variable to an integer type

Example intval()

 

Copy the code The code is as follows:

<?php
echo intval(4.3); //4
echo intval(4.6); // 4
?> 

 

PHP rounding to exact decimal places and rounding

(1) php retains three decimal places and rounds up

 

Copy the code The code is as follows:

  
$num=0.0215489;
echo sprintf("%.3f", $num); // 0.022

 

　　(2) php retains three decimal places without rounding

 

Copy the code The code is as follows:

$num=0.0215489;
echo substr(sprintf("%.4f", $num),0,-1); // 0.021 

 

　　(3) php takes an integer by one method (this will be used in the page number program of the paging program)

 

Copy the code The code is as follows:

echo ceil(4.3);    // 5
echo ceil(9.999);  // 10

 

　　(4) php rounding method to take an integer

 

Copy the code The code is as follows:

  
echo floor(4.3);   // 4
echo floor(9.999); // 9

 

　　(5), round function

　　Example 1. round() example

 

Copy the code The code is as follows:

  
<?php
echo round(3.4);         // 3
echo round(3.5);         // 4
echo round(3.6);         // 4
echo round(3.6, 0);      // 4
echo round(1.95583, 2);  // 1.96
echo round(1241757, -3); // 1242000
echo round(5.045, 2);    // 5.05
echo round(5.055, 2);    // 5.06
?> 

 

PHP rounding the most accurate way to two decimal places

 

Copy the code The code is as follows:

<?php
$number = 123213.066666;
echo sprintf("%.2f", $number);
?>

 

Output result:
123213.07